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3 years ago

8

Two identical rocks are dropped from different heights. The higher one starts out four times as high as the lower one. How much

faster is the higher one going just before they hit?

1 answer:

kodGreya [7K]3 years ago

6 0

Answer:

it is going 4 times faster.

Explanation:

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How much heat does it take to bring 0.12 kg of liquid water at 100c to steam at 140c

Vadim26 [7]

Answer:

162

Explanation:

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3 years ago

The difference between psychological disorder and what is normal

Musya8 [376]

Answer:

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3 years ago

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What is the primary mode of energy transfer from hot coffee inside a Thermos bottle to the environment? View Available Hint(s) P

Keith_Richards [23]

Answer Part A: radiation

Part B: conduction

Part C: conduction

Part D: conduction

Part E: conduction

Part F: radiation

Part G::radiation

Part H : convection

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Radiation is heat transfer through empty space .

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4 years ago

A farmer with 600 ft of available fencing wants to enclose a rectangular are located adjacent to a farmhouse (with no fencing re

Goshia [24]

Answer:

The corresponding dimensions will be "x = 300 & y = 60".

Explanation:

Available fencing = 600 ft

Fencing,

⇒ $5y+x=600$

⇒ $x=600-5y$

As we know,

⇒ $Area =xy$

On substituting the given values, we get

$=(600-5y)y$

$=600y-5y^2$ ...(equation 1)

On differentiating with respect to y, we get

⇒ $\frac{dA}{dy} =600-10y$

$0 = 600-10y$

$600=10y$

$y=\frac{600}{10}$

$y=60$

On putting the values of y in equation 1, we get

⇒ $600(60)-5(60)^2$

⇒ $600(60)-5(3600)$

⇒ $36000 - 18000$

⇒ $18000$

Dimensions of the rectangular area:

x = 300

y = 60

3 0

3 years ago

In certain cases, using both the momentum principle and energy principle to analyze a system is useful, as they each can reveal

SpyIntel [72]

Answer:

A) F_g = 26284.48 N

B) v = 7404.18 m/s

C) E = 19.19 × 10^(10) J

Explanation:

We are given;

Mass of satellite; m = 3500 kg

Mass of the earth; M = 6 x 10²⁴ Kg

Earth circular orbit radius; R = 7.3 x 10⁶ m

A) Formula for the gravitational force is;

F_g = GmM/r²

Where G is gravitational constant = 6.67 × 10^(-11) N.m²/kg²

Plugging in the relevant values, we have;

F_g = (6.67 × 10^(-11) × 3500 × 6 x 10²⁴)/(7.3 x 10⁶)²

F_g = 26284.48 N

B) From the momentum principle, we have that the gravitational force is equal to the centripetal force.

Thus;

GmM/r² = mv²/r

Making v th subject, we have;

v = √(GM/r)

Plugging in the relevant values;

v = √(6.67 × 10^(-11) × 6 x 10²⁴)/(7.3 x 10⁶))

v = 7404.18 m/s

C) From the energy principle, the minimum amount of work is given by;

E = (GmM/r) - ½mv²

Plugging in the relevant values;

E = [(6.67 × 10^(-11) × 3500 × 6 × 10²⁴)/(7.3 x 10⁶)] - (½ × 3500 × 7404.18)

E = 19.19 × 10^(10) J

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3 years ago